Topic: Algorithmically placed FPGA miner: 255MH/s/chip, supports all known boards - page 40. (Read 119429 times)

Who are you? Apple or Samsung?

False, but you did figure out what this is a countdown for

What a tease. You'd better release something that goes 300 mhash/s at 10 watts, if you're going to keep us in suspense like this.

aww 10 Days ....

It's probably just counting down to the end of the month in your time zone

Nice!
There is a bug on the website, here it is saying 10d 12h.
-5 hours have passed since Garr255 posted.

10d 7h on the spot

OH SHI-

It's also worth noting that the Spartan 6 engineering sample versions of the chips don't have the DNA register.

I never got a pony and I've led a miserable life.

Would u be interested in one of the new Enterpoint Quad boards to try this bitstream on?


And have you come up with a pricing scheme or any ideas in that area yet?



cheers

Thanks for the offer!  I think I'm set for now, though.  I only need the ztex boards for power measurements... my own mining is done with my own boards (much cheaper than ztex boards, but lower quality and less power-efficient).  My personal boards also have upgradeable power supplies and software-adjustable voltage, which is really helpful for debugging and experimentation.

Speaking of which, here's another reason for the boardmakers to consider software-adjustable voltage supplies: every piece of mining equipment can be run until either (1) it fails or (2) the value of the BTC it produces falls below the cost of the electricity used.  FPGAs last a long time, so ultimately when you buy an FPGA miner you should plan on running it until several more generations of FPGAs have come out (which will each be more power-efficient than the last, ultimately driving up the difficulty).  We're talking about 2-3 years from now.

Anyways, power consumption scales linearly with clock rate, which (for a fixed design) scales linearly with performance.  However, the power consumption scales with the square of the voltage supplied.  This means that after 2-3 years you can underclock and undervolt your FPGA and keep it running profitably for another year or two.  I'm already doing this with Virtex-2 Pros.  I know that 2-3 years out is a long time horizon for bitcoiners, and many of the boardmakers may be out of business by then, but it's worth planning for.


Like I said, I make my own boards.  The ztex board was only because my own boards leak power.


Yes, they email me constantly.  I've gotten very good at finding new and creative ways to say "I'm working on it".

A 12A regulator is enough power iff 265 MH/s is enough performance.

Hi,

the enterpoint unit, https://bitcointalksearch.org/topic/cairnsmore1-quad-xc6slx150-board-78239 , has four 12A regulators, are they enough?


spiccioli

I am producing a batch of Ztex 1.15y boards under license, so I have blank PCBs which are supposed to go in the SMD line coming week or so. I don't think that the regulator I have been looking at (datasheet sent to you via email) is pin compatible, but I would think with a little bit of soldering it can be made to work (I could be completely wrong). Same for other components that need to be changed in the power chain.

In absolutely worst case, supplying the FPGAs their power from a different source might be a possibility for a test run. Either way, if it is possible or not to hack a Ztex PCB this way needs to be confirmed by my colleague, who is putting the boards together. But my offer stands, I would volunteer to send you a (modified if possible or stock) 1.15y out of my production run so you have something to test.

I don't think the Ztex products are designed for anything higher than 8A/FPGA, so this would only be for engineering tests, retrofitting is not what I had in mind. Stefan would probably be the very best person to put something together for you, when I come to think of it. Or any of the other FPGA makers who design their own products, like ngzhang, FPGAMining LLC or the new UK company (not sure if you have a preference for Ztex though).

Edit: In fact I believe the designers/manufacturers are watching this thread for YOU to post some useful numbers so that they know what power requirements to use for any future products (I believe it has even been mentioned in one or two of their threads).

Correct.  It's secondhand.


Hrm, don't think that'll be necessary, but out of curiosity, how do you do this?  Is there a pin-compatible 15A version of the chip ztex is using?  Do you desolder the old one (yikes!)?  Doesn't this necessitate changing some of the other components in the power supply circuitry, like the inductor loop?

On the upside, if this is possible, maybe ztex will start offering 15A boards as an option.  Or somebody might go into business reworking the 8A boards, although I'm not sure that's cost-effective... board rework is really expensive.

I assume you did your test run on the Ztex 1.15x (single FPGA), not the 1.15y (quad FPGA) board?

If you need a quad board for a while, let me know. There is a slight chance I could also place 4 15A regulators instead of the 8A stock ones on a board for your tests.

My ztex board finally arrived yesterday; I've posted very-preliminary power numbers.  I still have at least one power-reduction trick up my sleeve, but I don't think it's going to close the gap.  You should expect my design to give fewer MH/J than ztex's design; that much is certain.

What's for the farm?

scnr